Microsoft releases an updated version of this tool on the second Tuesday of each month. New versions are available through this Web page, Windows Update, and the Microsoft Download Center.

使用后的感觉是象一个测试软件，简陋，效果还没有我常用的一些免费软件好。
看来，我是不会再用它的了。

今天又试了一次，结果如下：
No malicious software was detected.

To help avoid infection in the future, visit the Protect Your PC site.

Win32/Bagle Not Infected.
Win32/Berbew Not Infected.
Win32/Bropia Not Infected.
Win32/Doomjuice Not Infected.
Win32/Gaobot Not Infected.
Win32/Goweh Not Infected.
Win32/Hackdef Not Infected.
Win32/Korgo Not Infected.
Win32/Mimail Not Infected.
Win32/Msblast Not Infected.
Win32/Mydoom Not Infected.
Win32/Nachi Not Infected.
Win32/Netsky Not Infected.
Win32/Randex Not Infected.
Win32/Rbot Not Infected.
Win32/Sasser Not Infected.
Win32/Sober Not Infected.
Win32/Sobig Not Infected.
Win32/Zafi Not Infected.
Win32/Zindos Not Infected.